ui/base/cursor/cursor_util.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/base/cursor/cursor_util.h"
   6
   7 #include "base/logging.h"
   8 #include "skia/ext/image_operations.h"
   9 #include "ui/gfx/point_conversions.h"
  10 #include "ui/gfx/size_conversions.h"
  11 #include "ui/gfx/skbitmap_operations.h"
  12 #include "ui/gfx/skia_util.h"
  13
  14 namespace ui {
  15
  16 void ScaleAndRotateCursorBitmapAndHotpoint(float scale,
  17                                            gfx::Display::Rotation rotation,
  18                                            SkBitmap* bitmap,
  19                                            gfx::Point* hotpoint) {
  20   switch (rotation) {
  21     case gfx::Display::ROTATE_0:
  22       break;
  23     case gfx::Display::ROTATE_90:
  24       hotpoint->SetPoint(bitmap->height() - hotpoint->y(), hotpoint->x());
  25       *bitmap = SkBitmapOperations::Rotate(
  26           *bitmap, SkBitmapOperations::ROTATION_90_CW);
  27       break;
  28     case gfx::Display::ROTATE_180:
  29       hotpoint->SetPoint(
  30           bitmap->width() - hotpoint->x(), bitmap->height() - hotpoint->y());
  31       *bitmap = SkBitmapOperations::Rotate(
  32           *bitmap, SkBitmapOperations::ROTATION_180_CW);
  33       break;
  34     case gfx::Display::ROTATE_270:
  35       hotpoint->SetPoint(hotpoint->y(), bitmap->width() - hotpoint->x());
  36       *bitmap = SkBitmapOperations::Rotate(
  37           *bitmap, SkBitmapOperations::ROTATION_270_CW);
  38       break;
  39   }
  40
  41   if (scale < FLT_EPSILON) {
  42     NOTREACHED() << "Scale must be larger than 0.";
  43     scale = 1.0f;
  44   }
  45
  46   if (scale == 1.0f)
  47     return;
  48
  49   gfx::Size scaled_size = gfx::ToFlooredSize(
  50       gfx::ScaleSize(gfx::Size(bitmap->width(), bitmap->height()), scale));
  51
  52   *bitmap = skia::ImageOperations::Resize(
  53       *bitmap,
  54       skia::ImageOperations::RESIZE_BETTER,
  55       scaled_size.width(),
  56       scaled_size.height());
  57   *hotpoint = gfx::ToFlooredPoint(gfx::ScalePoint(*hotpoint, scale));
  58 }
  59
  60 }  // namespace ui